"V8, the engine powering Node.js, does offer support for it."
There's no guarantee that const will be used in the same way in the future. I bring this up because of the bevy of articles that discuss the express framework (remember when it shifted major version number?) and other frameworks that have seen backwards-incompatible changes.
"The current implementation of const is a Mozilla-specific extension and is not part of ECMAScript 5."
https://developer.mozilla.org/en-US/docs/JavaScript/Referenc...